Slope exchange processes in the Weddell and Amundsen Seas
This thesis aims to investigate the dynamical processes of the along-slope currents in the Weddell and Amundsen Seas (Antarctica), their variability and the mechanisms that regulate the cross-slope exchange of properties. Firstly, this thesis explores the short-term and spatial variability of the An...
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ftuniveastangl:oai:ueaeprints.uea.ac.uk:70550 2023-05-15T13:24:14+02:00 Slope exchange processes in the Weddell and Amundsen Seas Do Valle Chagas Azaneu, Marina 2019-01 application/pdf https://ueaeprints.uea.ac.uk/id/eprint/70550/ https://ueaeprints.uea.ac.uk/id/eprint/70550/1/Thesis_Azaneu_2018_corrected.pdf en eng https://ueaeprints.uea.ac.uk/id/eprint/70550/1/Thesis_Azaneu_2018_corrected.pdf Do Valle Chagas Azaneu, Marina (2019) Slope exchange processes in the Weddell and Amundsen Seas. Doctoral thesis, University of East Anglia. Thesis NonPeerReviewed 2019 ftuniveastangl 2023-01-30T21:50:08Z This thesis aims to investigate the dynamical processes of the along-slope currents in the Weddell and Amundsen Seas (Antarctica), their variability and the mechanisms that regulate the cross-slope exchange of properties. Firstly, this thesis explores the short-term and spatial variability of the Antarctic Slope Front system at the northwestern Weddell Sea using data from three ocean gliders. Twenty-two sections along the eastern Antarctic Peninsula are grouped regionally and composited by isobaths. The along-slope transport of the Antarctic Slope Current (upper 1000 m) varies between 0.2 and 5.9 Sv. Higher eddy kinetic energy (0.003m2s¡2) is observed on sections where dense water is present, possibly due to baroclinic instabilities in the deep layer. These results provide some of the first observational confirmation of the high frequency variability associated with an active eddy field that has been suggested by recent numerical simulations in this region. Using a multidisciplinary dataset, the physical processes associated with phytoplankton biomass distribution and how these relate to frontal processes east of the Antarctic Peninsula are assessed. There is a distinction between upperslope and off-shelf areas, which are likely disassociated from each other. Over the shelf, the relatively low stratification and the likely enhanced mixing and nutrient input from sediments would contribute to the relatively high primary production. Offshore, the stronger pycnocline and passive sinking of phytoplankton creates a deeper subsurface chlorophyll maximum. Finally, observations from moorings and from ship-based hydrographic stations at eastern Amundsen Sea are analysed to investigate the variability of the slope undercurrent and the Circumpolar Deep Water layer within troughs at the continental shelf. The cumulative onshore temperature transport of CDW was 1.21 TW and 1.79 TW at the central and eastern trough, respectively. High-frequency variability of temperature transport estimates are different among ... Thesis Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Weddell Sea University of East Anglia: UEA Digital Repository Amundsen Sea Antarctic Antarctic Peninsula The Antarctic Weddell Weddell Sea |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
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ftuniveastangl |
language |
English |
description |
This thesis aims to investigate the dynamical processes of the along-slope currents in the Weddell and Amundsen Seas (Antarctica), their variability and the mechanisms that regulate the cross-slope exchange of properties. Firstly, this thesis explores the short-term and spatial variability of the Antarctic Slope Front system at the northwestern Weddell Sea using data from three ocean gliders. Twenty-two sections along the eastern Antarctic Peninsula are grouped regionally and composited by isobaths. The along-slope transport of the Antarctic Slope Current (upper 1000 m) varies between 0.2 and 5.9 Sv. Higher eddy kinetic energy (0.003m2s¡2) is observed on sections where dense water is present, possibly due to baroclinic instabilities in the deep layer. These results provide some of the first observational confirmation of the high frequency variability associated with an active eddy field that has been suggested by recent numerical simulations in this region. Using a multidisciplinary dataset, the physical processes associated with phytoplankton biomass distribution and how these relate to frontal processes east of the Antarctic Peninsula are assessed. There is a distinction between upperslope and off-shelf areas, which are likely disassociated from each other. Over the shelf, the relatively low stratification and the likely enhanced mixing and nutrient input from sediments would contribute to the relatively high primary production. Offshore, the stronger pycnocline and passive sinking of phytoplankton creates a deeper subsurface chlorophyll maximum. Finally, observations from moorings and from ship-based hydrographic stations at eastern Amundsen Sea are analysed to investigate the variability of the slope undercurrent and the Circumpolar Deep Water layer within troughs at the continental shelf. The cumulative onshore temperature transport of CDW was 1.21 TW and 1.79 TW at the central and eastern trough, respectively. High-frequency variability of temperature transport estimates are different among ... |
format |
Thesis |
author |
Do Valle Chagas Azaneu, Marina |
spellingShingle |
Do Valle Chagas Azaneu, Marina Slope exchange processes in the Weddell and Amundsen Seas |
author_facet |
Do Valle Chagas Azaneu, Marina |
author_sort |
Do Valle Chagas Azaneu, Marina |
title |
Slope exchange processes in the Weddell and Amundsen Seas |
title_short |
Slope exchange processes in the Weddell and Amundsen Seas |
title_full |
Slope exchange processes in the Weddell and Amundsen Seas |
title_fullStr |
Slope exchange processes in the Weddell and Amundsen Seas |
title_full_unstemmed |
Slope exchange processes in the Weddell and Amundsen Seas |
title_sort |
slope exchange processes in the weddell and amundsen seas |
publishDate |
2019 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/70550/ https://ueaeprints.uea.ac.uk/id/eprint/70550/1/Thesis_Azaneu_2018_corrected.pdf |
geographic |
Amundsen Sea Antarctic Antarctic Peninsula The Antarctic Weddell Weddell Sea |
geographic_facet |
Amundsen Sea Antarctic Antarctic Peninsula The Antarctic Weddell Weddell Sea |
genre |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Weddell Sea |
genre_facet |
Amundsen Sea Antarc* Antarctic Antarctic Peninsula Antarctica Weddell Sea |
op_relation |
https://ueaeprints.uea.ac.uk/id/eprint/70550/1/Thesis_Azaneu_2018_corrected.pdf Do Valle Chagas Azaneu, Marina (2019) Slope exchange processes in the Weddell and Amundsen Seas. Doctoral thesis, University of East Anglia. |
_version_ |
1766378167573938176 |